Crucible de-wetting during bridgman growth of semiconductors in microgravity

Duffar, T.; Paret-Harter, I.; Dusserre, P

doi:10.1016/0022-0248(90)90620-z

Cited by 64 publications

(39 citation statements)

References 22 publications

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“…This is expected to quickly solidify, and the crystal will be attached to the crucible. These results demonstrate the importance of the meniscus geometry, as determined by pressure and contact angle, and are consistent with prior stability ideas based on meniscus mechanics [8,[16][17][18][19]. However, the source of instability in this computation has its origins in heat transfer, as argued in [14].…”

Section: Effect Of Meniscus Shapesupporting

confidence: 88%

“…The prevailing wisdom for conducting detached growth on earth is to establish a liquid meniscus between the crystal and the crucible wall and maintain it by controlling the pressure difference between the gas space above the melt and the gap. This practice follows early theoretical analyses of the stability of the process that concentrated on meniscus mechanics and indicated that dewetted growth depends on the wetting angles of the melt with the ampoule and the crystal and the pressure applied along the gas-liquid meniscus [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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On favorable thermal fields for detached Bridgman growth

Stelian

Volz

Derby

2009

Journal of Crystal Growth

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The thermal fields of two Bridgman-like configurations, representative of real systems used in prior experiments for the detached growth of CdTe and Ge crystals, are studied. These detailed heat transfer computations are performed using the CrysMAS code and expand upon our previous analyses [14] that posited a new mechanism involving the thermal field and meniscus position to explain stable conditions for dewetted Bridgman growth. Computational results indicate that heat transfer conditions that led to successful detached growth in both of these systems are in accordance with our prior assertion, namely that the prevention of crystal reattachment to the crucible wall requires the avoidance of any undercooling of the melt meniscus during the growth run. Significantly, relatively simple process modifications that promote favorable thermal conditions for detached growth may overcome detrimental factors associated with meniscus shape and crucible wetting. Thus, these ideas may be important to advance the practice of detached growth for many materials.

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Section: Effect Of Meniscus Shapesupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

On favorable thermal fields for detached Bridgman growth

Stelian

Volz

Derby

2009

Journal of Crystal Growth

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“…An explanation of the phenomenon has been given in the case of rough and smooth crucible [14]; this phenomenon is called "detachment" or "dewetting". The detached growth improves crystal quality [15][16][17][18] because the gap compensates for the differential contraction of the crystal and the crucible on cooling leading to decrease compressive stress. Two orders of magnitude of reduction in dislocation density have been reported [19].…”

Section: Introductionmentioning

confidence: 99%

Growth and anisotropy of transport properties of detached Cd0.78Zn0.22Te crystals

Gamal

Zied

Ebnalwaled

2007

Journal of Alloys and Compounds

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“…The effect of the crucible roughness has been studied by Duffar et al [2] and solidification experiments under microgravity [3] have confirmed the theoretical predictions. It is not likely that this configuration can be used for dewetting on the earth, except for a very small liquid height, because the hydrostatic pressure forces the liquid into the crucible wall cavities.…”

Section: Introductionmentioning

confidence: 66%

Contribution to the stability analysis of the dewetted Bridgman growth under microgravity conditions

Bizet¹,

Duffar²

2004

Cryst. Res. Technol.

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Experimental observations show that the gap between the sample and the crucible, commonly obtained after solidification in microgravity, is remarkably stable. With the aim to understand the reason of this stability, the dewetting phenomenon is studied by Lyapunov's method. After a short review of the existing mechanisms leading to dewetting, the open smooth crucible configuration is chosen as the most representative. The analytical stability analysis, taking into account geometrical and thermal effects, performed under some boundary heat transfer approximations, shows that, in most cases, the dewetting process is intrinsically stable.

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Crucible de-wetting during bridgman growth of semiconductors in microgravity

Cited by 64 publications

References 22 publications

On favorable thermal fields for detached Bridgman growth

On favorable thermal fields for detached Bridgman growth

Growth and anisotropy of transport properties of detached Cd0.78Zn0.22Te crystals

Contribution to the stability analysis of the dewetted Bridgman growth under microgravity conditions

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